v0.26.0

Added

• Runtime.Physics optional assembly (Cuvara.DOTS.Physics) — gated by
  com.unity.physics >= 1.0.0. PhysicsBodyFactory (dynamic/static/kinematic),
  CollisionEventSystem, SpatialQuery (overlap sphere, raycast, closest body),
  PhysicsMovementBridge (MoveData → PhysicsVelocity sync).
• Robust despawn — EntityViewRegistry.SweepDestroyed() detects views whose
  GameObject was destroyed externally and cleans up stale entries.
• Chunk provisioner metrics — ChunkState enum (Pending/Warming/Warm/Released),
  ChunkStates dictionary, WarmChunkCount/PendingChunkCount, OnChunkStateChanged
  event.
• View overlay anchors — ViewOverlayAnchor component, ViewOverlayBuffer
  singleton, ViewOverlayCollectJob (Burst), ViewOverlaySystem for world-space
  health bars and name plates.
• Editor debug window — Window > Cuvara > DOTS View Debug: live view counts,
  key states, deferred spawn tracking.
• ProductionHardening sample — scripted 7-step demo of all new features.
• Documentation — Documentation~/OVERVIEW.md, VIEW-PROVISIONING.md,
  NETCODE-INTEGRATION.md.
• Diagnostic APIs — TotalViews, TotalKeys, LiveCountsByKey, DeferralsByKey
  on EntityViewRegistry.

Fixed

• EntityViewDespawnSystem now sweeps externally-destroyed GameObjects every frame.